There Is Snow in Wangchuan River

She traveled back in time five hundred years ago just to kill the future demon king, but she didn't expect that this boy would become a demon for her. After her death, she was reborn as a baby and was adopted as a disciple by a former friend. And he guarded her for five hundred years in order to resurrect her. When they met again, he was the Demon Lord that everyone feared, but she just wanted to kill him. [Time Travel × Master and Disciple × Fateful Reincarnation × Male Protagonist's Paranoia and Madness × Female Protagonist's Growth and Revenge]